HerokuにPython Djangoをデプロイするときエラー「No matching distribution found for anaconda-client==1.6...」

DjangoをHerokuにデプロイするときこんなエラーに遭遇しました。

$ git push heroku master
Counting objects: 499, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (493/493), done.
Writing objects: 100% (499/499), 1.20 MiB | 576.00 KiB/s, done.
Total 499 (delta 156), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Python app detected
remote: -----> Installing requirements with pip
remote:        Collecting alabaster==0.7.10 (from -r /tmp/build_xxx/requirements.txt (line 1))
remote:          Downloading https://files.pythonhosted.org/packages/2e/c3/xxx/alabaster-0.7.10-py2.py3-none-any.whl
remote:        Collecting anaconda-client==1.6.14 (from -r /tmp/build_xxx/requirements.txt (line 2))
remote:          Could not find a version that satisfies the requirement anaconda-client==1.6.14 (from -r /tmp/build_xxx/requirements.txt (line 2)) (from versions: 1.1.1, 1.2.2)
remote:        No matching distribution found for anaconda-client==1.6.14 (from -r /tmp/build_xxx/requirements.txt (line 2))
remote:  !     Push rejected, failed to compile Python app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...
remote: 
remote: !   Push rejected to djangogirlsblog.
remote: 
To https://git.heroku.com/djangogirlsblog.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/djangogirlsblog.git'

anaconda-clientが見つかりませんでした、というエラーです。

原因

仮想環境を作っていないために、pip freezeコマンドで requirements.txtを作成すると、ローカルにインストールしたライブラリがすべて出てしまうことが原因です。

解決策

仮想環境を作って、Herokuに必要なライブラリだけを pip install してから pip freeze でrequirements.txtを作成します。

python -m venv heroku_env       # 仮想環境を作る(Python 3.3からの標準機能)
source heroku_env/bin/activate  # 仮想環境をアクティベート
pip install --upgrade pip       # pipアップグレード
pip install django-toolbelt     # pipにDjangoインストール（他に必要なライブラリがあればそれも入れます）
pip freeze > requirements.txt   # requirements.txtを再作成
git add .
git commit -m 'comment'
git push heroku master          # デプロイ

こんな感じになったら成功

$ git push heroku master
Counting objects: 501, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (495/495), done.
Writing objects: 100% (501/501), 1.20 MiB | 578.00 KiB/s, done.
Total 501 (delta 158), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Python app detected
remote: -----> Installing requirements with pip
remote: 
remote: -----> Discovering process types
remote:        Procfile declares types -> web
remote: 
remote: -----> Compressing...
remote:        Done: 65.8M
remote: -----> Launching...
remote:        Released v16
remote:        https://djangogirlsblog.herokuapp.com/ deployed to Heroku
remote: 
remote: Verifying deploy... done.
To https://git.heroku.com/djangogirlsblog.git
   8f60f8f..ade1264  master -> master

Author : 溝江 智徳